28267988 has 24 divisors (see below), whose sum is σ = 56700672. Its totient is φ = 12079584.

The previous prime is 28267979. The next prime is 28267999. The reversal of 28267988 is 88976282.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9845 + ... + 12387.

It is an arithmetic number, because the mean of its divisors is an integer number (2362528).

Almost surely, 2^28267988 is an apocalyptic number.

28267988 is a gapful number since it is divisible by the number (28) formed by its first and last digit.

It is an amenable number.

28267988 is an abundant number, since it is smaller than the sum of its proper divisors (28432684).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

28267988 is a wasteful number, since it uses less digits than its factorization.

28267988 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2951 (or 2949 counting only the distinct ones).

The product of its digits is 774144, while the sum is 50.

The square root of 28267988 is about 5316.7648057818. The cubic root of 28267988 is about 304.6245959100.

The spelling of 28267988 in words is "twenty-eight million, two hundred sixty-seven thousand, nine hundred eighty-eight".